BCM6123xD1E5126yzz
PMBus™ Control Signal Characteristics
Specifications apply over all line, load conditions, unless otherwise noted; boldface specifications apply over the temperature range of
-40°C ≤ TINTERNAL ≤ 125°C (T-Grade); All other specifications are at TINTERNAL = 25ºC unless otherwise noted.
UART SER-IN / SER-OUT Pins
• Universal Asynchronous Receiver/Transmitter (UART) pins.
• The BCM communication version is not intended to be used without a Digital Supervisor.
• Isolated I2C communication and telemetry is available when using Vicor Digital Isolator and Vicor Digital Supervisor. Please see specific product data sheet
for more details.
• UART SER-IN pin is internally pulled high using a 1.5kΩ to 3.3V.
SIGNAL TYPE
GENERAL I/O
STATE
ATTRIBUTE
Baud Rate
SYMBOL
CONDITIONS / NOTES
MIN
TYP
750
MAX UNIT
BRUART
Rate
Kbit/s
SER-IN Pin
VSER-IN_IH
VSER-IN_IL
2.3
V
SER-IN Input Voltage Range
1
V
ns
ns
kΩ
pF
DIGITAL
INPUT
SER-IN rise time
SER-IN fall time
SER-IN RPULLUP
tSER-IN_RISE 10% to 90%
tSER-IN_FALL 10% to 90%
RSER-IN_PLP Pull up to 3.3V
CSER-IN_EXT
400
25
1.5
SER-IN External Capacitance
400
Regular
Operation
SER-OUT Pin
VSER-OUT_OH 0mA ≥ IOH ≥ -4mA
VSER-OUT_OL 0mA ≤ IOL ≤ 4mA
2.8
V
V
SER-OUT Output Voltage
Range
0.5
DIGITAL
OUTPUT
SER-OUT rise time
tSER-OUT_RISE 10% to 90%
tSER-OUT_FALL 10% to 90%
55
45
ns
ns
SER-OUT fall time
SER-OUT source current
SER-OUT output impedance
ISER-OUT
ZSER-OUT
VSER-OUT = 2.8V
6
mA
Ω
120
Enable / Disable Control
• The EN pin is a standard analog I/O configured as an input to an internal µC.
• It is internally pulled high to 3.3V.
• When held low the BCM internal bias will be disabled and the powertrain will be inactive.
• In an array of BCMs, EN pins should be interconnected to synchronize startup.
• Enable / disable command will have no effect if the EN pin is disabled.
SIGNAL TYPE
STATE
ATTRIBUTE
SYMBOL
CONDITIONS / NOTES
MIN
2.3
TYP
250
MAX UNIT
VPRI_DC > VPRI_UVLO+
,
Startup
EN to Powertrain active time
tEN_START
EN held low both conditions satisfied
for t > tPRI_UVLO+_DELAY
µs
ANALOG
INPUT
EN Voltage Threshold
EN Resistance (Internal)
EN Disable Threshold
VENABLE
REN_INT
V
Regular
Operation
Internal pull up resistor
1.5
kΩ
VEN_DISABLE_TH
1
V
BCM® Bus Converter
Page 14 of 30
Rev 1.1
01/2017
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800 927.9474
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